Sumbe weather in September

In September, Sumbe sees average daytime highs of 21°C and overnight lows near 20°C, with 1 mm of rain across 0.4 wet days and about 11.9 hours of daylight. It is the 10th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 69% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Sumbe's 2nd-clearest and 6th-windiest month. For the whole year in context, see Sumbe's year-round climate.

Daytime high
21°
10th warmest
Overnight low
20°
3rd coldest
Rainfall
1 mm
0.4 wet days
Daylight
11 h 54 min
6:01 AM – 5:57 PM
Cloud cover
32%
2nd clearest
Wind
12 km/h
6th windiest
Solar energy
5.68 kWh/m²
Travel score
8.4
out of 10

Sumbe is city in Cuanza Sul, Angola.

Density
44/km²
people per km²
Founded
1889

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 21°C through the month.

A typical September day in Sumbe reaches about 21°C in the afternoon and slips back to 20°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 22°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°C cooler than October.

15°18°20°23°25°151015202530
Avg high (°C)Avg low (°C)
12020
22020
32020
42020
52020
62120
72120
82120
92120
102120
112120
122120
132120
142120
152120
162120
172120
182120
192121
202121
212121
222121
232121
242221
252221
262221
272221
282221
292221
302221

Sumbe weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 25°354.212.67.4
Feb27° / 26°39512.46.9
Mar27° / 26°12810.612.16.1
Apr27° / 26°536.611.86.9
May25° / 24°20.311.58.7
Jun23° / 22°20.111.48.7
Jul21° / 20°1011.48.2
Aug20° / 19°0011.68.3
Sep21° / 20°10.411.98.4
Oct23° / 23°61.812.38.3
Nov25° / 24°23412.57.6
Dec25° / 25°314.512.67.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 69% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 15%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18713
28713
38713
48614
58713
68713
78713
88713
98713
108713
118713
128713
138614
148614
158614
168614
178614
188515
198515
208515
218515
228515
238416
248416
258416
268416
278317
288317
298218
308218

Chance of precipitation in September

Any precipitation

Sumbe gets around 1 mm of rain over 0.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 1% and peaks near 2% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
10
20
30
40
50
60
71
81
91
101
111
121
132
142
152
162
172
182
192
202
212
222
232
242
252
262
272
282
292
302

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 80% of days. Sticky, muggy-or-worse air turns up on roughly 80% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
141590
239610
338620
436640
534660
632680
731690
829710
927730
1026740
1124760
1223770
1322780
1420800
1519810
1618820
1716840
1815850
1914860
2012880
2111881
2210891
239901
248911
257912
266922
275923
285923
294924
303925

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over September. Sunrise moves from 6:11 AM to 5:51 AM, and sunset from 5:58 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:115:58
211.86:105:58
311.86:105:58
411.86:095:58
511.86:085:58
611.86:085:58
711.86:075:58
811.96:065:58
911.96:065:57
1011.96:055:57
1111.96:045:57
1211.96:045:57
1311.96:035:57
1411.96:025:57
1511.96:015:57
1611.96:015:57
1711.96:005:57
1812.05:595:57
1912.05:595:57
2012.05:585:57
2112.05:575:57
2212.05:575:57
2312.05:565:57
2412.05:555:57
2512.05:555:57
2612.05:545:57
2712.15:535:57
2812.15:535:57
2912.15:525:57
3012.15:515:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.68 kWh/m².

For context, solar energy here swings from a low near 4.53 kWh/m² to a high of 5.97 kWh/m² in January across the year — September's 5.68 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
Planning a trip in September

Is September a good time to visit Sumbe?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

8.4
Sightseeing
3rd-best month of the year
5.2
Beach & pool
10th-best month of the year

September is one of the better times to visit Sumbe for general sightseeing.

What to pack for Sumbe in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Sumbe sees daytime highs around 21°C and nights near 20°C. Worth packing: sun protection.

sun protection

Sea temperature near Sumbe in September

The nearest coast averages about 21°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in March at about 28°C and coldest in August near 20°C.

It's comfortable for a long swim from Aug 23 to Aug 9 — about 11.6 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb27Warm
Mar28Warm
Apr27Warm
May25Warm
Jun23Refreshing
Jul21Refreshing
Aug20Cool
Sep21Refreshing
Oct24Refreshing
Nov26Warm
Dec26Warm

UV index in Sumbe in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sumbe peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 14 at about 7 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highVery highExtremeMar 14UV 15Aug 14UV 7
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar15Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug7High
Sep8Very high
Oct11Extreme
Nov12Extreme
Dec13Extreme

Air quality in Sumbe in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Sumbe is worst in July — around 23 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (March, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1722 µg/m³Mar 138 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb8Good
Mar8Good
Apr9Good
May13Moderate
Jun17Moderate
Jul23Moderate
Aug18Moderate
Sep16Moderate
Oct12Moderate
Nov8Good
Dec9Good
Location & terrain

Where is Sumbe?

Sumbe sits at 11.2°S, 13.8°E, 10 m above sea level, in Angola. The nearest listed city is Porto Amboim, 53 km away.

ChindumboCubal do LumboLobito

Topography around Sumbe

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sumbe.

Within 3 km, the terrain around Sumbe has only modest variations in elevation — a maximum elevation change of 134 m around an average of 23 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 292 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,820 m.

The land around Sumbe is covered by water (31%), artificial surfaces (30%) and grassland (26%) within 3 km, water (46%) and grassland (26%) within 16 km, and water (32%), trees (26%) and grassland (26%) within 80 km.

3 km
134 m
16 km
292 m
80 km
1,820 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Porto Amboim 53 km · Conda 55 km · Ucu Seles 55 km · Capunda 68 km · Gabela 71 km · Chindumbo 107 km · Cubal do Lumbo 127 km · Lobito 133 km

Angola travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
220 V · 50 Hz
Prices
≈ 35% of US
price level, 2025
GDP per capita
$3,129
2025
Happiness
3.8 / 10
World Happiness, 2017
Homicide rate
4.1
per 100k, 2016
Road deaths
26.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Very low
EF EPI 413
Religion
Roman Catholic 41%Protestant 38%none 12%other 9%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Sumbe (-11.206°, 13.8437°, elevation 10 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).